We stayed at Siri's apartment for over a month after staying there for a week and then deciding to stay for longer. Siri was extremely helpful with any problems we had (the wifi router broke and she had it replaced within the day) and her English is excellent which made communicating no problem at all. Location wise, if you know Bangkok, you'll know that Soi 11 is one of the main places to be at night. The condo, on Google maps, can look like it's quite a large distant from Sukhumvit (the address is new petchburi) but it's not when you realise that you can take the back exit from the building, walk over the canal bridge and you are on soi 11. There is even a free tuk run by the building to take you to the BTS (and another to take you to the MTR). The apartment itself is great, it's small, but high quality. The mattress is high quality, the pillows were soft feather (nice and rare to get a comfortable bed in Thailand!). The building itself is one of the most social we've stayed at - the pool is always busy, the gym has people in it and the library has people working away all the time. You're bound to end up chatting to a few residents and making friends.